Improvement in compositions for bearings



eater sate fitted time Letters Patent No. 108,931, dated November 1,1870.

IMPROVEMENT IN COMPOSlTlOMS FOR BEARINGS.

The Schedule referred to in these Letters Patent and making part of thesame I, ELIZA Dexfun MURFEY, of New York, county of New York, State of New-York, have invented an Improved .Oomposition for Bearings, 850., ofwhich the following is a'specification.

Nature and Object of the I mention.

My invention relates to compositions, such as are employed in a powderedor pasty state, as substitutes for ordinary lubricants, or in acondensed state as substitutes for metallic bearings.

My improved composition consists 0t pulverized plumbago', combined withfinely-eomminuted leather, hide, or skin, and (it necessary) with burnthair and ivory-dust, and paraliinc or its equivalent, holding rubber insolution.

The leather, hide, or skin, is turn, rasped, or otherwise finelycomminntecl, and is thoroughly mixed with pl-nmbago, with which it ispreferable to combine sufticicnt melted parafline to form a liquid pastymass.

After the shreds have become thoroughly impregnated with the plumbago,the mass is condensed un- [ML new h, A

der heat and pressure so as to expel nearly all the parafiine and form ahard solid block.v 7

After the said block has become cool, it is broken up and then ground inany suitable grinding-machine to form a powder, which may be employed onbearings and journals in the same manner as the usual lubricating andbearing compositions.

Claims.

.1. The compositiolrior bearings and journals, &c,, consisting of the ingredientsherein described.

2. The process of manufacturing thesaid composition by combining andcondensing the materials, forming a solid mass, and then grinding orcom'minuting the latter, as set forth. V

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

\Vitnesses: ELIZA DEXTER, MURFEY.

Trroams PRUDEN, J. ROMAIN BROWN.

